When we update a VM configuration while it is running, for example a change in
the network interfaces, we recreate a domain from the running XML which is fine
but this is not valid anymore when the VM is stopped.
So in the latter case, we keep an attribute on the VM indicating if we need to
recreate the VM instance from the XML when it stops.

Since a network interface cannot change.

Only one network interface was shown in the tags.

With the permission of Romain Degez, CTO of Smartjog.

Signed-off-by: Sébastien Luttringer <sebastien.luttringer@smartjog.com>

Libvirtd version 0.8.8 is capable of handling connections to virtio consoles but
the Python API is broken.

Moved to cc-common

Indicates if driver used for disk backing is using some sort of caching which
may lead to data corruption for a live migration.

Harmless renaming.

Support for registering/unregistering sub object to the cc-server.
Support for tag lifecycle handling (libev), was previously managed by plugins.